Use one render loop per QQuickWindow

See the task for the full reasoning behind this patch.

The threaded renderloop has been refactored to have one window per
thread. This is mostly a simplification of the current code path where
for loops over multiple windows are turned into if (window).

The QSGContext has been split into two classes, QSGRenderContext
for which there is one per OpenGLContext.

The rest of the patch is name changes and a couple of cleanups
in the hopes of simplifying this change.

Task-number: QTBUG-33993

Change-Id: I31c81f9694d7da7474a72333169be38de62613c4
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/quick/scenegraph/qsgwindowsrenderloop_p.h b/src/quick/scenegraph/qsgwindowsrenderloop_p.h
index cb01e1e04b..ff5529646b 100644
--- a/src/quick/scenegraph/qsgwindowsrenderloop_p.h
+++ b/src/quick/scenegraph/qsgwindowsrenderloop_p.h
@@ -51,11 +51,14 @@
 
 QT_BEGIN_NAMESPACE
 
+class QSGRenderContext;
+
 class QSGWindowsRenderLoop : public QSGRenderLoop
 {
     Q_OBJECT
 public:
     explicit QSGWindowsRenderLoop();
+    ~QSGWindowsRenderLoop();
 
     void show(QQuickWindow *window);
     void hide(QQuickWindow *window);
@@ -71,6 +74,7 @@ public:
     QAnimationDriver *animationDriver() const { return m_animationDriver; }
 
     QSGContext *sceneGraphContext() const { return m_sg; }
+    QSGRenderContext *createRenderContext(QSGContext *) const { return m_rc; }
 
     void releaseResources(QQuickWindow *) { }
 
@@ -102,6 +106,7 @@ private:
 
     QOpenGLContext *m_gl;
     QSGContext *m_sg;
+    QSGRenderContext *m_rc;
 
     QAnimationDriver *m_animationDriver;